| Challenger - Francavilla | 05/07 10:50 | 14 | Nicolas Barrientos v Enrico Dalla Valle | 6-1,0-6,5-7 | |
| Challenger - Cagliari | 05/02 08:00 | 19 | [261] Steven Diez v Nicolas Barrientos [66] | 6-0,4-6,6-3 | |
| Challenger - Cagliari | 05/01 13:30 | 14 | [66] Nicolas Barrientos v Lucas Miedler [38] | 6-2,6-1 | |
| Challenger - Roma | 04/23 14:00 | 14 | [62] Nicolas Barrientos v Francesco Forti [361] | 3-6,1-6 | |
| Challenger - Puerto Vallarta | 03/05 22:05 | 14 | [61] Nicolas Barrientos v Illya Marchenko [388] | 1-6,3-6 | |
| Taça Davis | 02/04 21:50 | 45 | Nicolas Barrientos v Daniel Evans | Cancelled | |
| Taça Davis | 02/03 23:00 | 45 | [67] Nicolas Barrientos v Cameron Norrie [11] | 2-6,5-7 | |
| Challenger Gwangju | 10/04 06:15 | 25 | [360] Nicolas Barrientos v Jason Jung [453] | 1-6,6-4,6-7 | |
| Taça Davis | 09/18 17:40 | 4 | [349] Nicolas Barrientos v Yanki Erel [440] | 6-4,7-5 | |
| Challenger - Santo Domingo | 08/16 18:00 | 25 | [316] Nicolas Alvarez v Nicolas Barrientos [350] | 7-5,4-6,6-3 | |
| Challenger - Santo Domingo | 08/16 18:00 | 25 | Gastao Elias v Nicolas Barrientos | Cancelled | |
| Challenger - Santo Domingo | 08/15 18:00 | 19 | [350] Nicolas Barrientos v Arklon H D P Cordova [485] | 6-2,6-4 | |
| Challenger - Santo Domingo | 08/14 16:35 | 14 | Nicolas Barrientos v Alejandro Jose Gandini | 6-3,6-1 | |
| ATP - Los Cabos | 08/03 00:00 | 25 | Alex Hernandez v Nicolas Barrientos | 3-6,6-4,6-4 | |
| ATP - Los Cabos | 08/01 03:25 | 19 | [177] Kaichi Uchida v Nicolas Barrientos [350] | 6-1,4-6,6-4 | |
| ATP - Los Cabos | 07/31 03:10 | 14 | [378] Michail Pervolarakis v Nicolas Barrientos [350] | 3-6,4-6 | |
| ATP - Umag | 07/23 14:00 | 26 | [131] Elias Ymer v Nicolas Barrientos [347] | 6-4,6-7,7-5 | |
| Challenger - Amersfoort | 07/10 12:45 | 45 | [385] Inigo Cervantes v Nicolas Barrientos [353] | 6-4,6-1 | |
| Challenger - Parma | 06/13 11:05 | 19 | [276] Oriol Roca Batalla v Nicolas Barrientos [347] | 3-6,6-3,6-1 | |
| Challenger - Parma | 06/12 12:30 | 14 | Gabriele Piraino v Nicolas Barrientos | 7-6,3-6,6-7 | |
| Challenger - Perúgia | 06/06 11:00 | 19 | Nicolas Barrientos v Giorgio Tabacco | 4-6,6-3,1-6 | |
| Challenger - Perúgia | 06/05 12:00 | 14 | Nicolas Barrientos v Gabriele Piraino | 7-5,6-3 | |
| Challenger de Vicenza | 05/24 10:55 | 25 | [359] Nicolas Barrientos v Daniel Dutra Da Silva [273] | 0-6,4-6 | |
| Challenger de Vicenza | 05/23 08:00 | 19 | Nicolas Barrientos v Riccardo Balzerani | 6-4,6-0 | |
| Challenger - Aguascalientes | 04/20 16:00 | 26 | [374] Nicolas Barrientos v Filip C Jianu [305] | 5-7,2-6 | |
| Challenger - Aguascalientes | 04/19 17:30 | 25 | [374] Nicolas Barrientos v Malek Jaziri [315] | 6-3,6-4 | |
| Challenger - Aguascalientes | 04/19 17:20 | 25 | Nicolas Barrientos v Nicola Kuhn | Cancelled | |
| Challenger - Aguascalientes | 04/18 17:55 | 19 | [315] Malek Jaziri v Nicolas Barrientos [374] | 4-6,2-6 | |
| Challenger - Aguascalientes | 04/17 21:35 | 14 | Alex Hernandez v Nicolas Barrientos | 3-6,4-6 | |
| Challenger - Cidade do México | 04/06 18:10 | 26 | [413] Nicolas Barrientos v Gerald Melzer [271] | 1-6,1-6 |